Parking at Uni should be easier and safer!

[xwhatsit]

there was this light some place cant recall where but i stopped for about 10min waiting for it to go green but wouldnt, moved my bike to find the pressure sensors, but it just would not detect me,
could be that my bike is too light, but is 160kg light?? anyways i just gased it on the red and dont know if that light ever turned green sence... hahah
which show that pressure sensors are sh!t....

For those of you who are stopped by these things, it's been discussed quite a few times on KB.

I can trigger any of them now, and I've probably got the lightest bike with the least metal out of any of you (125kgs).

The sensors are not pressure-sensitive, they rely on an inductive loop. Look on the road, and you'll see a rectangle `carved' into the road, cut in half down the middle. Get your bike directly on top of the line that cuts the rectangle in half. 95% of the time that will trigger it, but if it's been set not sensitive enough, try popping your centrestand (or sidestand if your bike is teh suck) down to get some more metal closer to it. Most of the time you don't trigger it, because if you're riding correctly you won't be in the middle of the road, especially at intersections (major oil and shit dropped there), so it's counter-intuitive.

I do probably 75% of my kilometres after the lights have switched to `trigger-only' mode and the only time I had to run a light was before I knew about this information -- and once since, as the lights were red from all directions, and weren't changing for anybody (?!).

[motorbyclist]

hold on.

induction requires a change in magnetic field - i'e your lump of iron has to be moving

they do detect if you're running red lights that way....

to detect a staionary vehicle you have to use weight (specially if the bike chassis is made of not steel (say magnesium or aluminium)

but i suppose to get there one has to be moving at some point, and i suppose my stoppies would have the right effect as i'm in the middle of the lane for obvious "in case of fuckup" reasons - but your stand wouldn't.

pressure is force over area: so lifting your bike on it's stand puts ALOT of force on a very small point, which deforms the road alot more than when your bike is on both wheels. lowering your stand (which i suppose is ferrous(ie steel), so it should be magnetic) wouldn't cause much...


so who was the traffic engineer who came up with the induction theory? want to be sure it isn't just blind speculation...

maybe the field generated by the spark plug / leads has an effect? i've seen it affect many bullet cams put on bikes near the engine (starter motor is especially good at it)

[motorbyclist]

and once since, as the lights were red from all directions, and weren't changing for anybody (?!).

in onehunga i nearly got knocked off by a guy in a holden - we were oncoming, i was tuning left and him right into the same street and i had a green light.

apparently so did he, and being a typical holden driver, didn't slow down but instead slammed his horn - as if i can stop dead mid corner.

two greens... yeah right! i don't really believe it seeing as the left turn and straight ahead/right lights were green on my side, and for him to have any green at all is just ridiculous

[xwhatsit]

hold on.

induction requires a change in magnetic field - i'e your lump of iron has to be moving

they do detect if you're running red lights that way....

to detect a staionary vehicle you have to use weight (specially if the bike chassis is made of not steel (say magnesium or aluminium)

but i suppose to get there one has to be moving at some point, and i suppose my stoppies would have the right effect as i'm in the middle of the lane for obvious "in case of fuckup" reasons - but your stand wouldn't.

pressure is force over area: so lifting your bike on it's stand puts ALOT of force on a very small point, which deforms the road alot more than when your bike is on both wheels. lowering your stand (which i suppose is ferrous(ie steel), so it should be magnetic) wouldn't cause much...


so who was the traffic engineer who came up with the induction theory? want to be sure it isn't just blind speculation...

maybe the field generated by the spark plug / leads has an effect? i've seen it affect many bullet cams put on bikes near the engine (starter motor is especially good at it)

I'm a classical musician/compsci student, not a physics student. I just heard the word `induction' used when this was being discussed. Loop of wires underneath that carved-out rectangle.

Perhaps it measures a difference in the magnetic field, from a normalised value to when you park over it.

They definitely don't run off pressure. That is confirmed.

At any rate the sensitive bit is bang-smack in the middle of that rectangle. You'll switch them every time.

[HungusMaximist]

For those of you who are stopped by these things, it's been discussed quite a few times on KB.

I can trigger any of them now, and I've probably got the lightest bike with the least metal out of any of you (125kgs).

The sensors are not pressure-sensitive, they rely on an inductive loop. Look on the road, and you'll see a rectangle `carved' into the road, cut in half down the middle. Get your bike directly on top of the line that cuts the rectangle in half. 95% of the time that will trigger it, but if it's been set not sensitive enough, try popping your centrestand (or sidestand if your bike is teh suck) down to get some more metal closer to it. Most of the time you don't trigger it, because if you're riding correctly you won't be in the middle of the road, especially at intersections (major oil and shit dropped there), so it's counter-intuitive.

I do probably 75% of my kilometres after the lights have switched to `trigger-only' mode and the only time I had to run a light was before I knew about this information -- and once since, as the lights were red from all directions, and weren't changing for anybody (?!).

Hey that's some interesting stuff bro. I'd always wondered if they were pressure or something more advanced.

Hey bro, are you able to make it to strata this afternoon around 4-5ish?

We're gonna have a few $10 dollar specials and if you do, your round is on me! That's a promise!